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When happiness points in one direction while wisdom, truth, integrity, and common sense point in another, that's when really smart people start doing really stupid things.

Andy Stanley (2011). “The Principle of the Path: How to Get from Where You Are to Where You Want to Be”, p.59, Thomas Nelson Inc
When happiness points in one direction while wisdom, truth, integrity, and common sense point in another, that's when really smart people start doing really stupid things.